a crate for packing soap
"The old factory still keeps its antique wooden crates, which are technically called soapboxes, used to pack bars of lye soap before shipping."
A crate for packing soap.
"The old wooden crate labeled 'soap' was actually just a repurposed soapbox used to transport bars down to the market before they were unpacked into boxes."
To give a speech from (or as if from) a soapbox.
"He climbed onto an old wooden crate and began his impassioned plea for better traffic laws, effectively turning the busy corner into a makeshift soapbox."